Expansible reamer



G. NIEDERMAYER IEXP-ANSIBLE REAMER.

APPLICATION FILED 0C.T.-25.-1919.

Patented Sept. 12, 1922,,

2 SHEETS-SHEET- 1.

J //l ZV/ l/ 7/ u G. NIEDERMAYER EXPANSIBLE REAMER. APPLICATION men OCT.25.4919.

Patented Sept. 12 1922?.

fizz/aerial: W W 530 new 2 SHEETS-SHEET 2.

GEORGE nIEnEE AvEE, oEoLEvELANn, oHIo, ASSIGNOR TO THE TELL-MAonINE-ee'rooL 00., or CLEVELAND, 01:10,- A CORPORATION OFeOHIOf a Applicationfiiedociotei; 25,1919 "seen 333,321? a To all whom itmay'c'oiioem.

Be it known that I, G ORGE NlEfiERM'AYER, a citizen of Hungary, residentof Cleveland, county of Cuyahoga, and State of. 'Ohio, have invented newand useful Im rove ments in Expansible Reamers', of which the followingis a specification, thep'rinci'ple' of the invention being herelnexplained and the best mode in which I have contemplated applyingthatprincipe, so'as to distinguish it from other'inventio'n s'," 1

My invention relates to expansible ream ers, its object being'toconstruct ayrean' er of thls character Wh1Cl1 mty,be CQI1OIII1C- allymanufactured, and which will be eflig' cient in the performanceofjits'functio'ns.

The said invention consists of means" here j inafter' fully describedand'particularly set forth in the claims); a

The annexed drawings and the following description setforth in detailcertain means embodying my' "invention, the disclosed means, however,constituting but one of the various mechanical forms in (which theprinciple of the invention may be a plied. In said annexed drawings:Figurel represents a side elevation of a reamer embodying" my invention.

Figure 2 represents an axial section of said reamer, taken upon theplane indicated by line II-II in Figure 4.

Figure 3 represents an axial section taken upon the in Figure 4.

Figure 4: represents a cross section taken upon the plane indicated byline IV-'IV in Figure 2.

Figure 5 represents a cross section taken' upon the plane indicated byline V-V in F1 ure 2. v

igure 6 represents a cross section taken upon the plane indicated byline VIVI in Figure 2.

Figure 7 representsa cross section taken' upon the plane indicated byline VIIVII in Figure 2.

Figure 8 represents a side elevation of an expansible cylinder reamerembodying my invention.

Figure 9 represents a plan of said cylinder reamer.

Figure 10 represents across section of the cylinder reamer.-

jclusive, and Figures 11 plane indicated by line III III bushing 5.Adjacent to-this pilot is formed a thread 15, which isengaged by a nut16. Above this nut'is formed a cylindrical bear- -ing surface 17 uponwhich is mounted an actuating member or spool 18, its upper end.

one. of the blades, and Figure, '15 a top 1 plan thereof. i

The illustrated embodiment of my; inven Figure 13' a bottom fplan;

tion,'referring first to Figures 1 to] 7 in-' I to la inclusive, comprses a cylindrical hollow body 'meni; her '1 having an interior jcylindricalborei 2, the upperie'iid of which is threaded, as

at" 3. The lower end of this bore is con'' tracted, as are, whichcontractefd port'iong is provided with a bushing, 5 'forming 'acylindrical bearingsurface 6. The inter-e mediate" portion of the bodymember is pro-f vid'ed with radially extending slots 7, Figures lto 7inclusive-,i-aiidin these slotsare seated'reamer blades L'SKHTheinterir, ed es of each of these-'bladesifismade circular in crosssection,ivlierebyal longitudinal tyne:

drical bearing urfac "9 formed; ,i'l his' bearing surface isj'inclinedrelatively to the cutting edges 10 of the bla 'de', as shown in" Figures2 and 14, and has a circumference,

greater thana semi-circle. I

Extending into theinterior of the body member is a rotatable member 11provided wit-h threads 12which engage the threads 3. The inner end ofthis member 11 is provided with a pilot 14: which extends into andengages the bearing surface 6" of the engaging a shoulder '19 formedupon the member 11. This spool 18, Figure 11, 1s

preferably reduced at its middle portion, as shown, so as to form twocollars 18' 18.

These collars are formed with inclinedslots 20 and 21 respectively,forming slideways,

whose cross sections correspond with the cross section" of the inner endportions of the- The latter are seated in these the blades and slotsbeing such that these bearing surfaces will be secured in the slots sothat when the spool is moved longitudinally in the body of the reamer byturning the rod 11, that is, in the direction of the reamers axis, theblades will slide in the slots 7 and be moved inwardly or out-.

wardly according as the spool is moved in one or the other longitudinaldirection, all

as will be understood. It will be observed that the pilot 14 holds thelower end of the member 11 in perfect alignment, and thus facilitatesthe actuating function of the spool, and that when the spool is movedlongitudinally, it is held against rotation relatively to the bodymember, while being rotatable with reference to the rod 11.

A lock nut 22 is provided to fix the member 11 in place after therequired position In the modified form shown in Figures 8,

9 and 10, which is particularly adapted for use as a cylinder reamer,the construction is substantially the same as that above described, themain difference consisting in the provision of a hexagon head 25 formedon the body member, as shown in Figure 8, and the provision ofdovetailed grooves or slots 20 and 21, as shown in Figure 10, instead ofcylindrical ones.

clined bearings adapted to seat and slide in said slideways; and a rodhaving threaded engagement with the interiorly threaded end of said bodymember, said actuating member being rotatably mounted upon said rod butlongitudinally, fixed relatively thereto, said actuating member beingremovable with said rod through said open threaded end of said body.

2. In an expansible reamer, the combination of aholloW body member,formed with radial slots the bore of said member being contracted at oneend to form an axial bearing; blades mounted and adapted to slide insaid slots; an actuating member in said body member formedwith-longitudinal inclined slideways, the inner ends of said bladesbeing formed with inclined bearings adapted to seat and slide in saidslide ways; and a rod having threaded engagement at one end with thelarge bore end of said body member and a pilot at the other end engagingthe aforesaid axial bearing, said rod being formed intermediate its endswith a pair of abutments between which said actuating member is rotatably mounted upon said rod.

Signed by me this 16th day of October, 1919.

GEORGE NIEDERMAYER.

